Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
4th Edition
ISBN: 9780134110684
Author: Randall D. Knight (Professor Emeritus)
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 7, Problem 25EAP
The 100 kg block in FIGURE EX7.25 takes 6.0 s to reach the floor after being released from rest. What is the mass of the block on the left? The pulley is massless and frictionless.
FIGURE EX7.25
Expert Solution & Answer
Trending nowThis is a popular solution!
Learn your wayIncludes step-by-step video
schedule07:53
Students have asked these similar questions
Three forces act at point O as shown. Force F3lies in the x-y plane.
Select the expression that denotes a unit vector in the direction of F1 .
a. - 1/3 i - 2/3 j - 2/3 kb. - 1/3 i + 2/3 j + 2/3 kc. - 1/3 i + 2/3 j - 2/3 kd. - 1/3 i - 2/3 j + 2/3 k
Determine the direction angles (α, B ,y ) for F₂ .
a. (103ᵒ , 72.1ᵒ , 22.6ᵒ )
b. (103ᵒ ,108ᵒ , 22.6ᵒ )c. (76.7ᵒ , 72.1ᵒ ,157ᵒ )
d. (103ᵒ , 72.1ᵒ ,157ᵒ )
Determine the angle between F1 and F3 .
a. 26.0ᵒ
b. 132ᵒc. 90.0ᵒ
d. 0
Q7.The figure below shows two boxes connected to each other by a light cord that passes over a pulley with negligible friction. The box of mass
m1 = 3.80 kg
lies on a horizontal table with negligible friction, while the box of mass
m2 = 10.3 kg
hangs vertically.
Two boxes labeled m1 and m2 are attached together by a cord.
Box m1 lies on a horizontal table with the cord extending horizontally from its right side.
The cord extends horizontally from the right side of m1 then goes over a pulley and then straight down to m2.
Box m2 hangs from the cord.
(a)
What is the magnitude of the acceleration of each box (in m/s2)? (Here,
a1
is the acceleration of
m1,
and
a2
is the acceleration of
m2.)
a1
= m/s2
a2
= m/s2
(b)
What is the tension in the cord (in N)?
N
A projectile of mass 0.75 kg is shot straight up into the air with an initial speed of 20 m/s.
a. How high would it go if there were no air resistance?
b. If the projectile rises to a maximum height of 12 m, determine the magnitude of
the average force due to air resistance.
Chapter 7 Solutions
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Ch. 7 - You find yourself in the middle of a frozen lake...Ch. 7 - How does a sprinter sprint? What is the forward...Ch. 7 - How does a rocket take off? What is the upward...Ch. 7 - How do basketball players jump straight up into...Ch. 7 - A mosquito collides head-on with a car traveling...Ch. 7 - A mosquito collides head-on with a car traveling...Ch. 7 - A small car is pushing a large truck. They are...Ch. 7 - A very smart 3-year-old child is given a wagon for...Ch. 7 - Teams red blue are having a tug-of-war. According...Ch. 7 - Will hanging a magnet in front of the iron cart in...
Ch. 7 - FIGURE Q7.11 shows two masses at rest. The string...Ch. 7 - FIGURE Q7.12 shows two masses at rest. The string...Ch. 7 - The hand in FIGURE Q7.13 is pushing on the back of...Ch. 7 - A and B in FIGURE Q7.14 are connected by a...Ch. 7 - In case a in FIGURE Q7.15, block A is accelerated...Ch. 7 - For Exercises 1 through 5: a. Draw an interaction...Ch. 7 - For Exercises 1 through 5: a. Draw an interaction...Ch. 7 - For Exercises I through 5: a. Draw an interaction...Ch. 7 - For Exercises 1 through 5: a. Draw an interaction...Ch. 7 - For Exercises 1 through 5: a. Draw an interaction...Ch. 7 - a. How much force does an 80 kg astronaut exert on...Ch. 7 - Block B in FIGURE EX7.7 rests on a surface for...Ch. 7 - A 1000 kg car pushes a 2000 kg truck that has a...Ch. 7 - with masses of 1 kg, 2 kg, and 3 kg are lined up...Ch. 7 - A 3000 kg meteorite falls toward the earth. What...Ch. 7 - The foot of a 55 kg sprinter is on the ground for...Ch. 7 - A steel cable lying flat on the floor drags a 20...Ch. 7 - An 80 kg spacewalking astronaut pushes off a 640...Ch. 7 - The sled dog in FIGURE EX7.14 drags sleds A and B...Ch. 7 - Two-thirds of the weight of a 1500 kg car rests on...Ch. 7 - FIGURE EX7.16 shows two 1.0 kg blocks connected by...Ch. 7 - What is the tension in the rope of Figure EX7.17?...Ch. 7 - A 2.0-m-long, 500 g rope pulls a 10 kg block of...Ch. 7 - A woman living in a third-story apartment is...Ch. 7 - Two blocks are attached to opposite ends of a...Ch. 7 - The cable cars in San Francisco are pulled along...Ch. 7 - A 2.0 kg rope hangs from the ceiling. What is the...Ch. 7 - A mobile at the art museum has a 2.0 kg steel cat...Ch. 7 - The 1.0 kg block in FIGURE EX7.24 is tied to the...Ch. 7 - The 100 kg block in FIGURE EX7.25 takes 6.0 s to...Ch. 7 - FIGURE P7.26 shows two strong magnets on opposite...Ch. 7 - FIGURE P7.27 shows a 6.0 N force pushing two...Ch. 7 - 28. A rope of length L and mass m is suspended...Ch. 7 - Prob. 29EAPCh. 7 - 30. A Federation starship (2.0 × 106 kg) uses its...Ch. 7 - Your forehead can withstand a force of about 6.0...Ch. 7 - Bob, who has a mass of 75 kg, can throw a 500 g...Ch. 7 - Two packages at UPS start sliding down the 20°...Ch. 7 - The two blocks in FIGURE P7.34 are sliding down...Ch. 7 - The coefficient of static friction is 0.60 between...Ch. 7 - The block of mass M in FIGURE P7.36 slides on a...Ch. 7 - The 10.2 kg block in FIGURE P7.37 is held in place...Ch. 7 - The coefficient of kinetic friction between the...Ch. 7 - FIGURE P7.39 shows a block of mass m resting on a...Ch. 7 - A4.0 kg box is on a frictionless 35° slope and is...Ch. 7 - Prob. 41EAPCh. 7 - The 2000 kg cable car shown in FIGURE P7.42...Ch. 7 - The century-old ascensores in Valparaiso, Chile,...Ch. 7 - A 3200 kg helicopter is flying horizontally. A 250...Ch. 7 - A house painter uses the chair-and-pulley...Ch. 7 - A long, 1.0 kg rope hangs from a support that...Ch. 7 - Prob. 47EAPCh. 7 - Prob. 48EAPCh. 7 - Find an expression for the magnitude of the...Ch. 7 - Prob. 50EAPCh. 7 - Prob. 51EAPCh. 7 - Prob. 52EAPCh. 7 - The lower block in FIGURE CP7.53 is pulled on by a...Ch. 7 - Prob. 54EAPCh. 7 - Prob. 55EAPCh. 7 - A 40-cm-diameter, 50-cm-tall, 15 kg hollow...Ch. 7 - 57. FIGURE CP7.57 shows a 200 g hamster sitting on...Ch. 7 - Prob. 58EAP
Additional Science Textbook Solutions
Find more solutions based on key concepts
Youre sitting inside an uncharged, hollow spherical shell. Suddenly someone dumps a billion coulombs of charge ...
Essential University Physics: Volume 2 (3rd Edition)
Q5.24 You have two identical tennis balls and fill one with water. You release both balls simultaneously from t...
University Physics with Modern Physics (14th Edition)
17. A person can see clearly up close, but cannot focus on objects beyond 75.0 cm. She opts for contact lenses ...
College Physics (10th Edition)
26. Compute 3.24 m + 0.532 m to the correct number of significant figures.
3.7 m
3.77 m
3.772 m
3.7720 m
College Physics: A Strategic Approach (4th Edition)
Atmospheric Mass of Venus. The atmospheric pressure on Venus is 90 bars. What is the total mass of Venus’s atmo...
Life in the Universe (4th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Luke and his friends will play pinata game. He attached the 5 kg pinata to a string, and he is pulling it from a frictionless pulley. a. To make the pinata stable, how much force must Luke exert? Show FBD.arrow_forwardA 50.4 N force is applied to keep a blok of 24. 2 N on the side wall. The static and the kinetic friction coefficients are given as 0.60 and 0.40. Assume the blok is relased from stationary state, (.) a. Does the block start to move? b. What force the wall apply to the block?arrow_forwardThe heaviest watermelon weighed in at 159 kg (350.5 lbs.) and was grown by Chris Kent (USA) of Sevierville, Tennessee. Chris releases the watermelon from rest from the top of a 150.0m tall building by a small crane. We neglect air resistance. If needed, use 9.80 m/s2 for the magnitude of g. What is the time it takes to hit the ground after being released and what will be the final impact velocity when it hits the ground? Report answers to 3 sig figs.arrow_forward
- A monkey of mass m = 10.0 kg is holding on to two vines each of length l = 3.00 m. The vines form an angle with the horizontal of 40.0 degrees (see figure). The monkey is not moving and the vines are considered massless and not stretchable. a. What is the distance d between the mounting points of the vines at the top? b. Draw a free body diagram of the monkey and indicate all forces.arrow_forwardA 400-N body starts up the incline of 30o with the horizontal (fk = 0.2) with a velocity of 3m/s. a. How long must a 500-N horizontal force act on the body to increase its velocity to 8m/s? b. How far will the body travel while the force is acting?arrow_forwardThe figure shows a 100-kg block being released from rest from a height of 1.0 m. It then takes 0.64 s for it to reach the floor. What is the mass m of the block on the left? There is no friction or mass in the pulley, and the connecting rope is very light.arrow_forward
- Two blocks of mass 4 kg and 3 kg are each initially 7 m above the ground and they are connected with each other by massless cord that passes over massless and frictionless pulley. The pulley is 20 m above the ground. 2.5 s after system is released, a naughty boy cuts the cord. What maximum height does the lighter object reach after the system is released? Select one: а. 14.6 m b. 10.2 m C. 14.2 m d. 12.0 m e. 15.0 m Previous page O O Oarrow_forwardA ceiling fan turns at a rate of 20 RPM. A 1 gram bug hangs on to the end of a 50 cm fan blade. What is the magnitude of the frictional force between the bug’s feet and the blade?arrow_forwardConsider the system shown in the figure below with m1-20 kg, m2-12.5 kg. R-0.2 m, and the mass of the puilley M-5 kg. Object m2 is resting on the floor, and object m1 is 4 m above the floor when it is released from rest. The pulley axis is frictionless. The cord is massless, does not stretch, and does not slip on the pulley. a. Calculate the time interval required for m1 to hit the floor. b. How would your answer change if the pulley were massless?arrow_forward
- Your 10.0kg cell phone on a frictionless table is accelerated by a 5kg mass hanging from a table. How much time do you have to grab the cell phone if it is 25cm from the edge of the table? The rope and pulleys are frictionless and massless.arrow_forwardA 57.1 kg person jumps on the ground from a height of 1.42 m. If he lands stiffly (with his knee joints compressing by 0.500 cm). Calculate the force on the knee joint. Answer and provide with solutions a. 111916.00 N b. 16216.40 N c. 158920.72 N d. 1589.21 Narrow_forwardFernanda is standing on a scale while riding an elevator. The elevator accelerates upward from rest to 1.8m/s1.8m/s in 2.0 s. If the scale reads 720 N while the elevator is accelerating upwards, what is Fernanda’s mass?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON
College Physics
Physics
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Cengage Learning
University Physics (14th Edition)
Physics
ISBN:9780133969290
Author:Hugh D. Young, Roger A. Freedman
Publisher:PEARSON
Introduction To Quantum Mechanics
Physics
ISBN:9781107189638
Author:Griffiths, David J., Schroeter, Darrell F.
Publisher:Cambridge University Press
Physics for Scientists and Engineers
Physics
ISBN:9781337553278
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Lecture- Tutorials for Introductory Astronomy
Physics
ISBN:9780321820464
Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden
Publisher:Addison-Wesley
College Physics: A Strategic Approach (4th Editio...
Physics
ISBN:9780134609034
Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher:PEARSON
What Is Circular Motion? | Physics in Motion; Author: GPB Education;https://www.youtube.com/watch?v=1cL6pHmbQ2c;License: Standard YouTube License, CC-BY